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-rw-r--r--fs/smb/client/dir.c876
1 files changed, 876 insertions, 0 deletions
diff --git a/fs/smb/client/dir.c b/fs/smb/client/dir.c
new file mode 100644
index 0000000000..580a27a3a7
--- /dev/null
+++ b/fs/smb/client/dir.c
@@ -0,0 +1,876 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ *
+ * vfs operations that deal with dentries
+ *
+ * Copyright (C) International Business Machines Corp., 2002,2009
+ * Author(s): Steve French (sfrench@us.ibm.com)
+ *
+ */
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/slab.h>
+#include <linux/namei.h>
+#include <linux/mount.h>
+#include <linux/file.h>
+#include "cifsfs.h"
+#include "cifspdu.h"
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "cifs_debug.h"
+#include "cifs_fs_sb.h"
+#include "cifs_unicode.h"
+#include "fs_context.h"
+#include "cifs_ioctl.h"
+#include "fscache.h"
+
+static void
+renew_parental_timestamps(struct dentry *direntry)
+{
+ /* BB check if there is a way to get the kernel to do this or if we
+ really need this */
+ do {
+ cifs_set_time(direntry, jiffies);
+ direntry = direntry->d_parent;
+ } while (!IS_ROOT(direntry));
+}
+
+char *
+cifs_build_path_to_root(struct smb3_fs_context *ctx, struct cifs_sb_info *cifs_sb,
+ struct cifs_tcon *tcon, int add_treename)
+{
+ int pplen = ctx->prepath ? strlen(ctx->prepath) + 1 : 0;
+ int dfsplen;
+ char *full_path = NULL;
+
+ /* if no prefix path, simply set path to the root of share to "" */
+ if (pplen == 0) {
+ full_path = kzalloc(1, GFP_KERNEL);
+ return full_path;
+ }
+
+ if (add_treename)
+ dfsplen = strnlen(tcon->tree_name, MAX_TREE_SIZE + 1);
+ else
+ dfsplen = 0;
+
+ full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
+ if (full_path == NULL)
+ return full_path;
+
+ if (dfsplen)
+ memcpy(full_path, tcon->tree_name, dfsplen);
+ full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb);
+ memcpy(full_path + dfsplen + 1, ctx->prepath, pplen);
+ convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
+ return full_path;
+}
+
+/* Note: caller must free return buffer */
+const char *
+build_path_from_dentry(struct dentry *direntry, void *page)
+{
+ struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
+ struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
+ bool prefix = tcon->Flags & SMB_SHARE_IS_IN_DFS;
+
+ return build_path_from_dentry_optional_prefix(direntry, page,
+ prefix);
+}
+
+char *__build_path_from_dentry_optional_prefix(struct dentry *direntry, void *page,
+ const char *tree, int tree_len,
+ bool prefix)
+{
+ int dfsplen;
+ int pplen = 0;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
+ char dirsep = CIFS_DIR_SEP(cifs_sb);
+ char *s;
+
+ if (unlikely(!page))
+ return ERR_PTR(-ENOMEM);
+
+ if (prefix)
+ dfsplen = strnlen(tree, tree_len + 1);
+ else
+ dfsplen = 0;
+
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
+ pplen = cifs_sb->prepath ? strlen(cifs_sb->prepath) + 1 : 0;
+
+ s = dentry_path_raw(direntry, page, PATH_MAX);
+ if (IS_ERR(s))
+ return s;
+ if (!s[1]) // for root we want "", not "/"
+ s++;
+ if (s < (char *)page + pplen + dfsplen)
+ return ERR_PTR(-ENAMETOOLONG);
+ if (pplen) {
+ cifs_dbg(FYI, "using cifs_sb prepath <%s>\n", cifs_sb->prepath);
+ s -= pplen;
+ memcpy(s + 1, cifs_sb->prepath, pplen - 1);
+ *s = '/';
+ }
+ if (dirsep != '/') {
+ /* BB test paths to Windows with '/' in the midst of prepath */
+ char *p;
+
+ for (p = s; *p; p++)
+ if (*p == '/')
+ *p = dirsep;
+ }
+ if (dfsplen) {
+ s -= dfsplen;
+ memcpy(s, tree, dfsplen);
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
+ int i;
+ for (i = 0; i < dfsplen; i++) {
+ if (s[i] == '\\')
+ s[i] = '/';
+ }
+ }
+ }
+ return s;
+}
+
+char *build_path_from_dentry_optional_prefix(struct dentry *direntry, void *page,
+ bool prefix)
+{
+ struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
+ struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
+
+ return __build_path_from_dentry_optional_prefix(direntry, page, tcon->tree_name,
+ MAX_TREE_SIZE, prefix);
+}
+
+/*
+ * Don't allow path components longer than the server max.
+ * Don't allow the separator character in a path component.
+ * The VFS will not allow "/", but "\" is allowed by posix.
+ */
+static int
+check_name(struct dentry *direntry, struct cifs_tcon *tcon)
+{
+ struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
+ int i;
+
+ if (unlikely(tcon->fsAttrInfo.MaxPathNameComponentLength &&
+ direntry->d_name.len >
+ le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength)))
+ return -ENAMETOOLONG;
+
+ if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
+ for (i = 0; i < direntry->d_name.len; i++) {
+ if (direntry->d_name.name[i] == '\\') {
+ cifs_dbg(FYI, "Invalid file name\n");
+ return -EINVAL;
+ }
+ }
+ }
+ return 0;
+}
+
+
+/* Inode operations in similar order to how they appear in Linux file fs.h */
+
+static int cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
+ struct tcon_link *tlink, unsigned int oflags, umode_t mode, __u32 *oplock,
+ struct cifs_fid *fid, struct cifs_open_info_data *buf)
+{
+ int rc = -ENOENT;
+ int create_options = CREATE_NOT_DIR;
+ int desired_access;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+ struct cifs_tcon *tcon = tlink_tcon(tlink);
+ const char *full_path;
+ void *page = alloc_dentry_path();
+ struct inode *newinode = NULL;
+ int disposition;
+ struct TCP_Server_Info *server = tcon->ses->server;
+ struct cifs_open_parms oparms;
+
+ *oplock = 0;
+ if (tcon->ses->server->oplocks)
+ *oplock = REQ_OPLOCK;
+
+ full_path = build_path_from_dentry(direntry, page);
+ if (IS_ERR(full_path)) {
+ free_dentry_path(page);
+ return PTR_ERR(full_path);
+ }
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+ if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
+ (CIFS_UNIX_POSIX_PATH_OPS_CAP &
+ le64_to_cpu(tcon->fsUnixInfo.Capability))) {
+ rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
+ oflags, oplock, &fid->netfid, xid);
+ switch (rc) {
+ case 0:
+ if (newinode == NULL) {
+ /* query inode info */
+ goto cifs_create_get_file_info;
+ }
+
+ if (S_ISDIR(newinode->i_mode)) {
+ CIFSSMBClose(xid, tcon, fid->netfid);
+ iput(newinode);
+ rc = -EISDIR;
+ goto out;
+ }
+
+ if (!S_ISREG(newinode->i_mode)) {
+ /*
+ * The server may allow us to open things like
+ * FIFOs, but the client isn't set up to deal
+ * with that. If it's not a regular file, just
+ * close it and proceed as if it were a normal
+ * lookup.
+ */
+ CIFSSMBClose(xid, tcon, fid->netfid);
+ goto cifs_create_get_file_info;
+ }
+ /* success, no need to query */
+ goto cifs_create_set_dentry;
+
+ case -ENOENT:
+ goto cifs_create_get_file_info;
+
+ case -EIO:
+ case -EINVAL:
+ /*
+ * EIO could indicate that (posix open) operation is not
+ * supported, despite what server claimed in capability
+ * negotiation.
+ *
+ * POSIX open in samba versions 3.3.1 and earlier could
+ * incorrectly fail with invalid parameter.
+ */
+ tcon->broken_posix_open = true;
+ break;
+
+ case -EREMOTE:
+ case -EOPNOTSUPP:
+ /*
+ * EREMOTE indicates DFS junction, which is not handled
+ * in posix open. If either that or op not supported
+ * returned, follow the normal lookup.
+ */
+ break;
+
+ default:
+ goto out;
+ }
+ /*
+ * fallthrough to retry, using older open call, this is case
+ * where server does not support this SMB level, and falsely
+ * claims capability (also get here for DFS case which should be
+ * rare for path not covered on files)
+ */
+ }
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+ desired_access = 0;
+ if (OPEN_FMODE(oflags) & FMODE_READ)
+ desired_access |= GENERIC_READ; /* is this too little? */
+ if (OPEN_FMODE(oflags) & FMODE_WRITE)
+ desired_access |= GENERIC_WRITE;
+
+ disposition = FILE_OVERWRITE_IF;
+ if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
+ disposition = FILE_CREATE;
+ else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
+ disposition = FILE_OVERWRITE_IF;
+ else if ((oflags & O_CREAT) == O_CREAT)
+ disposition = FILE_OPEN_IF;
+ else
+ cifs_dbg(FYI, "Create flag not set in create function\n");
+
+ /*
+ * BB add processing to set equivalent of mode - e.g. via CreateX with
+ * ACLs
+ */
+
+ if (!server->ops->open) {
+ rc = -ENOSYS;
+ goto out;
+ }
+
+ /*
+ * if we're not using unix extensions, see if we need to set
+ * ATTR_READONLY on the create call
+ */
+ if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
+ create_options |= CREATE_OPTION_READONLY;
+
+ oparms = (struct cifs_open_parms) {
+ .tcon = tcon,
+ .cifs_sb = cifs_sb,
+ .desired_access = desired_access,
+ .create_options = cifs_create_options(cifs_sb, create_options),
+ .disposition = disposition,
+ .path = full_path,
+ .fid = fid,
+ .mode = mode,
+ };
+ rc = server->ops->open(xid, &oparms, oplock, buf);
+ if (rc) {
+ cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
+ goto out;
+ }
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+ /*
+ * If Open reported that we actually created a file then we now have to
+ * set the mode if possible.
+ */
+ if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
+ struct cifs_unix_set_info_args args = {
+ .mode = mode,
+ .ctime = NO_CHANGE_64,
+ .atime = NO_CHANGE_64,
+ .mtime = NO_CHANGE_64,
+ .device = 0,
+ };
+
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
+ args.uid = current_fsuid();
+ if (inode->i_mode & S_ISGID)
+ args.gid = inode->i_gid;
+ else
+ args.gid = current_fsgid();
+ } else {
+ args.uid = INVALID_UID; /* no change */
+ args.gid = INVALID_GID; /* no change */
+ }
+ CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
+ current->tgid);
+ } else {
+ /*
+ * BB implement mode setting via Windows security
+ * descriptors e.g.
+ */
+ /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
+
+ /* Could set r/o dos attribute if mode & 0222 == 0 */
+ }
+
+cifs_create_get_file_info:
+ /* server might mask mode so we have to query for it */
+ if (tcon->unix_ext)
+ rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
+ xid);
+ else {
+#else
+ {
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+ /* TODO: Add support for calling POSIX query info here, but passing in fid */
+ rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb, xid, fid);
+ if (newinode) {
+ if (server->ops->set_lease_key)
+ server->ops->set_lease_key(newinode, fid);
+ if ((*oplock & CIFS_CREATE_ACTION) && S_ISREG(newinode->i_mode)) {
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
+ newinode->i_mode = mode;
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
+ newinode->i_uid = current_fsuid();
+ if (inode->i_mode & S_ISGID)
+ newinode->i_gid = inode->i_gid;
+ else
+ newinode->i_gid = current_fsgid();
+ }
+ }
+ }
+ }
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+cifs_create_set_dentry:
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+ if (rc != 0) {
+ cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
+ rc);
+ goto out_err;
+ }
+
+ if (newinode)
+ if (S_ISDIR(newinode->i_mode)) {
+ rc = -EISDIR;
+ goto out_err;
+ }
+
+ d_drop(direntry);
+ d_add(direntry, newinode);
+
+out:
+ free_dentry_path(page);
+ return rc;
+
+out_err:
+ if (server->ops->close)
+ server->ops->close(xid, tcon, fid);
+ if (newinode)
+ iput(newinode);
+ goto out;
+}
+
+int
+cifs_atomic_open(struct inode *inode, struct dentry *direntry,
+ struct file *file, unsigned oflags, umode_t mode)
+{
+ int rc;
+ unsigned int xid;
+ struct tcon_link *tlink;
+ struct cifs_tcon *tcon;
+ struct TCP_Server_Info *server;
+ struct cifs_fid fid = {};
+ struct cifs_pending_open open;
+ __u32 oplock;
+ struct cifsFileInfo *file_info;
+ struct cifs_open_info_data buf = {};
+
+ if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb))))
+ return -EIO;
+
+ /*
+ * Posix open is only called (at lookup time) for file create now. For
+ * opens (rather than creates), because we do not know if it is a file
+ * or directory yet, and current Samba no longer allows us to do posix
+ * open on dirs, we could end up wasting an open call on what turns out
+ * to be a dir. For file opens, we wait to call posix open till
+ * cifs_open. It could be added to atomic_open in the future but the
+ * performance tradeoff of the extra network request when EISDIR or
+ * EACCES is returned would have to be weighed against the 50% reduction
+ * in network traffic in the other paths.
+ */
+ if (!(oflags & O_CREAT)) {
+ struct dentry *res;
+
+ /*
+ * Check for hashed negative dentry. We have already revalidated
+ * the dentry and it is fine. No need to perform another lookup.
+ */
+ if (!d_in_lookup(direntry))
+ return -ENOENT;
+
+ res = cifs_lookup(inode, direntry, 0);
+ if (IS_ERR(res))
+ return PTR_ERR(res);
+
+ return finish_no_open(file, res);
+ }
+
+ xid = get_xid();
+
+ cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
+ inode, direntry, direntry);
+
+ tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
+ if (IS_ERR(tlink)) {
+ rc = PTR_ERR(tlink);
+ goto out_free_xid;
+ }
+
+ tcon = tlink_tcon(tlink);
+
+ rc = check_name(direntry, tcon);
+ if (rc)
+ goto out;
+
+ server = tcon->ses->server;
+
+ if (server->ops->new_lease_key)
+ server->ops->new_lease_key(&fid);
+
+ cifs_add_pending_open(&fid, tlink, &open);
+
+ rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
+ &oplock, &fid, &buf);
+ if (rc) {
+ cifs_del_pending_open(&open);
+ goto out;
+ }
+
+ if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
+ file->f_mode |= FMODE_CREATED;
+
+ rc = finish_open(file, direntry, generic_file_open);
+ if (rc) {
+ if (server->ops->close)
+ server->ops->close(xid, tcon, &fid);
+ cifs_del_pending_open(&open);
+ goto out;
+ }
+
+ if (file->f_flags & O_DIRECT &&
+ CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
+ if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
+ file->f_op = &cifs_file_direct_nobrl_ops;
+ else
+ file->f_op = &cifs_file_direct_ops;
+ }
+
+ file_info = cifs_new_fileinfo(&fid, file, tlink, oplock, buf.symlink_target);
+ if (file_info == NULL) {
+ if (server->ops->close)
+ server->ops->close(xid, tcon, &fid);
+ cifs_del_pending_open(&open);
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ fscache_use_cookie(cifs_inode_cookie(file_inode(file)),
+ file->f_mode & FMODE_WRITE);
+
+out:
+ cifs_put_tlink(tlink);
+out_free_xid:
+ free_xid(xid);
+ cifs_free_open_info(&buf);
+ return rc;
+}
+
+int cifs_create(struct mnt_idmap *idmap, struct inode *inode,
+ struct dentry *direntry, umode_t mode, bool excl)
+{
+ int rc;
+ unsigned int xid = get_xid();
+ /*
+ * BB below access is probably too much for mknod to request
+ * but we have to do query and setpathinfo so requesting
+ * less could fail (unless we want to request getatr and setatr
+ * permissions (only). At least for POSIX we do not have to
+ * request so much.
+ */
+ unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
+ struct tcon_link *tlink;
+ struct cifs_tcon *tcon;
+ struct TCP_Server_Info *server;
+ struct cifs_fid fid;
+ __u32 oplock;
+ struct cifs_open_info_data buf = {};
+
+ cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
+ inode, direntry, direntry);
+
+ if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb)))) {
+ rc = -EIO;
+ goto out_free_xid;
+ }
+
+ tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
+ rc = PTR_ERR(tlink);
+ if (IS_ERR(tlink))
+ goto out_free_xid;
+
+ tcon = tlink_tcon(tlink);
+ server = tcon->ses->server;
+
+ if (server->ops->new_lease_key)
+ server->ops->new_lease_key(&fid);
+
+ rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode, &oplock, &fid, &buf);
+ if (!rc && server->ops->close)
+ server->ops->close(xid, tcon, &fid);
+
+ cifs_free_open_info(&buf);
+ cifs_put_tlink(tlink);
+out_free_xid:
+ free_xid(xid);
+ return rc;
+}
+
+int cifs_mknod(struct mnt_idmap *idmap, struct inode *inode,
+ struct dentry *direntry, umode_t mode, dev_t device_number)
+{
+ int rc = -EPERM;
+ unsigned int xid;
+ struct cifs_sb_info *cifs_sb;
+ struct tcon_link *tlink;
+ struct cifs_tcon *tcon;
+ const char *full_path;
+ void *page;
+
+ if (!old_valid_dev(device_number))
+ return -EINVAL;
+
+ cifs_sb = CIFS_SB(inode->i_sb);
+ if (unlikely(cifs_forced_shutdown(cifs_sb)))
+ return -EIO;
+
+ tlink = cifs_sb_tlink(cifs_sb);
+ if (IS_ERR(tlink))
+ return PTR_ERR(tlink);
+
+ page = alloc_dentry_path();
+ tcon = tlink_tcon(tlink);
+ xid = get_xid();
+
+ full_path = build_path_from_dentry(direntry, page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
+ goto mknod_out;
+ }
+
+ rc = tcon->ses->server->ops->make_node(xid, inode, direntry, tcon,
+ full_path, mode,
+ device_number);
+
+mknod_out:
+ free_dentry_path(page);
+ free_xid(xid);
+ cifs_put_tlink(tlink);
+ return rc;
+}
+
+struct dentry *
+cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
+ unsigned int flags)
+{
+ unsigned int xid;
+ int rc = 0; /* to get around spurious gcc warning, set to zero here */
+ struct cifs_sb_info *cifs_sb;
+ struct tcon_link *tlink;
+ struct cifs_tcon *pTcon;
+ struct inode *newInode = NULL;
+ const char *full_path;
+ void *page;
+ int retry_count = 0;
+
+ xid = get_xid();
+
+ cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
+ parent_dir_inode, direntry, direntry);
+
+ /* check whether path exists */
+
+ cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
+ tlink = cifs_sb_tlink(cifs_sb);
+ if (IS_ERR(tlink)) {
+ free_xid(xid);
+ return ERR_CAST(tlink);
+ }
+ pTcon = tlink_tcon(tlink);
+
+ rc = check_name(direntry, pTcon);
+ if (unlikely(rc)) {
+ cifs_put_tlink(tlink);
+ free_xid(xid);
+ return ERR_PTR(rc);
+ }
+
+ /* can not grab the rename sem here since it would
+ deadlock in the cases (beginning of sys_rename itself)
+ in which we already have the sb rename sem */
+ page = alloc_dentry_path();
+ full_path = build_path_from_dentry(direntry, page);
+ if (IS_ERR(full_path)) {
+ cifs_put_tlink(tlink);
+ free_xid(xid);
+ free_dentry_path(page);
+ return ERR_CAST(full_path);
+ }
+
+ if (d_really_is_positive(direntry)) {
+ cifs_dbg(FYI, "non-NULL inode in lookup\n");
+ } else {
+ cifs_dbg(FYI, "NULL inode in lookup\n");
+ }
+ cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
+ full_path, d_inode(direntry));
+
+again:
+ if (pTcon->posix_extensions)
+ rc = smb311_posix_get_inode_info(&newInode, full_path, parent_dir_inode->i_sb, xid);
+ else if (pTcon->unix_ext) {
+ rc = cifs_get_inode_info_unix(&newInode, full_path,
+ parent_dir_inode->i_sb, xid);
+ } else {
+ rc = cifs_get_inode_info(&newInode, full_path, NULL,
+ parent_dir_inode->i_sb, xid, NULL);
+ }
+
+ if (rc == 0) {
+ /* since paths are not looked up by component - the parent
+ directories are presumed to be good here */
+ renew_parental_timestamps(direntry);
+ } else if (rc == -EAGAIN && retry_count++ < 10) {
+ goto again;
+ } else if (rc == -ENOENT) {
+ cifs_set_time(direntry, jiffies);
+ newInode = NULL;
+ } else {
+ if (rc != -EACCES) {
+ cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
+ /* We special case check for Access Denied - since that
+ is a common return code */
+ }
+ newInode = ERR_PTR(rc);
+ }
+ free_dentry_path(page);
+ cifs_put_tlink(tlink);
+ free_xid(xid);
+ return d_splice_alias(newInode, direntry);
+}
+
+static int
+cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
+{
+ struct inode *inode;
+ int rc;
+
+ if (flags & LOOKUP_RCU)
+ return -ECHILD;
+
+ if (d_really_is_positive(direntry)) {
+ inode = d_inode(direntry);
+ if ((flags & LOOKUP_REVAL) && !CIFS_CACHE_READ(CIFS_I(inode)))
+ CIFS_I(inode)->time = 0; /* force reval */
+
+ rc = cifs_revalidate_dentry(direntry);
+ if (rc) {
+ cifs_dbg(FYI, "cifs_revalidate_dentry failed with rc=%d", rc);
+ switch (rc) {
+ case -ENOENT:
+ case -ESTALE:
+ /*
+ * Those errors mean the dentry is invalid
+ * (file was deleted or recreated)
+ */
+ return 0;
+ default:
+ /*
+ * Otherwise some unexpected error happened
+ * report it as-is to VFS layer
+ */
+ return rc;
+ }
+ }
+ else {
+ /*
+ * If the inode wasn't known to be a dfs entry when
+ * the dentry was instantiated, such as when created
+ * via ->readdir(), it needs to be set now since the
+ * attributes will have been updated by
+ * cifs_revalidate_dentry().
+ */
+ if (IS_AUTOMOUNT(inode) &&
+ !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
+ spin_lock(&direntry->d_lock);
+ direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
+ spin_unlock(&direntry->d_lock);
+ }
+
+ return 1;
+ }
+ }
+
+ /*
+ * This may be nfsd (or something), anyway, we can't see the
+ * intent of this. So, since this can be for creation, drop it.
+ */
+ if (!flags)
+ return 0;
+
+ /*
+ * Drop the negative dentry, in order to make sure to use the
+ * case sensitive name which is specified by user if this is
+ * for creation.
+ */
+ if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
+ return 0;
+
+ if (time_after(jiffies, cifs_get_time(direntry) + HZ) || !lookupCacheEnabled)
+ return 0;
+
+ return 1;
+}
+
+/* static int cifs_d_delete(struct dentry *direntry)
+{
+ int rc = 0;
+
+ cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry);
+
+ return rc;
+} */
+
+const struct dentry_operations cifs_dentry_ops = {
+ .d_revalidate = cifs_d_revalidate,
+ .d_automount = cifs_d_automount,
+/* d_delete: cifs_d_delete, */ /* not needed except for debugging */
+};
+
+static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
+{
+ struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
+ unsigned long hash;
+ wchar_t c;
+ int i, charlen;
+
+ hash = init_name_hash(dentry);
+ for (i = 0; i < q->len; i += charlen) {
+ charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
+ /* error out if we can't convert the character */
+ if (unlikely(charlen < 0))
+ return charlen;
+ hash = partial_name_hash(cifs_toupper(c), hash);
+ }
+ q->hash = end_name_hash(hash);
+
+ return 0;
+}
+
+static int cifs_ci_compare(const struct dentry *dentry,
+ unsigned int len, const char *str, const struct qstr *name)
+{
+ struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
+ wchar_t c1, c2;
+ int i, l1, l2;
+
+ /*
+ * We make the assumption here that uppercase characters in the local
+ * codepage are always the same length as their lowercase counterparts.
+ *
+ * If that's ever not the case, then this will fail to match it.
+ */
+ if (name->len != len)
+ return 1;
+
+ for (i = 0; i < len; i += l1) {
+ /* Convert characters in both strings to UTF-16. */
+ l1 = codepage->char2uni(&str[i], len - i, &c1);
+ l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
+
+ /*
+ * If we can't convert either character, just declare it to
+ * be 1 byte long and compare the original byte.
+ */
+ if (unlikely(l1 < 0 && l2 < 0)) {
+ if (str[i] != name->name[i])
+ return 1;
+ l1 = 1;
+ continue;
+ }
+
+ /*
+ * Here, we again ass|u|me that upper/lowercase versions of
+ * a character are the same length in the local NLS.
+ */
+ if (l1 != l2)
+ return 1;
+
+ /* Now compare uppercase versions of these characters */
+ if (cifs_toupper(c1) != cifs_toupper(c2))
+ return 1;
+ }
+
+ return 0;
+}
+
+const struct dentry_operations cifs_ci_dentry_ops = {
+ .d_revalidate = cifs_d_revalidate,
+ .d_hash = cifs_ci_hash,
+ .d_compare = cifs_ci_compare,
+ .d_automount = cifs_d_automount,
+};